Article(id=1320095744611172529, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320095743872971684, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20250948, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1767024000000, receivedDateStr=2025-12-30, revisedDate=1769356800000, revisedDateStr=2026-01-26, acceptedDate=null, acceptedDateStr=null, onlineDate=1792664951708, onlineDateStr=2026-10-22, pubDate=1778601600000, pubDateStr=2026-05-13, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792664951708, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792664951708, creator=13701087609, updateTime=1792664951708, updator=13701087609, issue=Issue{id=1320095743872971684, tenantId=1146029695717560320, journalId=1263187385517883426, year='2026', volume='54', issue='6', pageStart='1881', pageEnd='2170', issueExtLink='null', onlineDate='null', pubDate='1781884800000', pubDateStr='2026-06-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792664951531, creator='13701087609', updateTime=1792738533970, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320404371276411812, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320095743872971684, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320404371276411813, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1320095743872971684, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1901, endPage=1909, ext={EN=ArticleExt(id=1320095744804110514, articleId=1320095744611172529, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Energy Storage Properties of K0.5B0.5TiO3-SrTiO3 Ceramics, columnId=1263922769897599102, journalTitle=Journal of the Chinese Ceramic Society, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=
Introduction

Dielectric capacitors are widely used in pulsed power and electronic systems due to their high power density, long lifespan, and low cost. However, their energy density is considerably lower than that of batteries. Dielectric materials are the core components for enhancing capacitor performance. Although conventional lead-based ceramics (e.g., PZT) exhibit the superior properties, their toxicity drives the development of environmentally friendly lead-free alternatives as a major research focus. Bismuth-based perovskite materials, due to the similar electronic configurations of Bi3+ and Pb2+, demonstrate ferroelectric properties comparable to those of lead-based materials. Among them, bismuth potassium titanate (i.e., K0.5Bi0.5TiO3, KBT) stands out as a highly promising lead-free energy storage candidate due to its combination of high theoretical polarization and a wide bandgap. However, a pure KBT is a typical ferroelectric with a high remnant polarization, which limits its energy storage performance. In general, introducing a paraelectric material into a ferroelectric to form a relaxor ferroelectric can disrupt a long-range order and refine ferroelectric domains, thereby improving energy storage characteristics. This study selected quantum paraelectric SrTiO3 (ST) to form a solid solution with KBT. The effect of ST content on the crystal structure, microstructure, dielectric, and ferroelectric properties was investigated. The ceramics maintained a pure perovskite phase with increasing ST content, showing a shift of the dielectric peak to lower temperatures with an enhanced frequency dispersion and gradually slimmer polarization-electric field hysteresis loops. The optimal composition (i.e., 0.6KBT-0.4ST) achieved a recoverable energy storage density of 3.64 J/cm3 and an energy efficiency of 70% in an electric field of 210 kV/cm, along with good temperature and frequency stability. The results indicated that KBT-ST is a promising class of high-performance lead-free dielectric materials for energy storage applications.

Methods

In this study, (1-x)KBT-xST ceramics (where x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by a conventional solid-state sintering method. The starting raw materials were Bi2O3 (≥99%), K2CO3 (≥99%), TiO2 (≥99%), and SrCO3 (≥99%), from Aladdin Co., China. Prior to weighing, K2CO3 powder was dried in a muffle furnace at 200 ℃ for 2 h to remove absorbed moisture. The raw materials were then weighed according to the stoichiometric ratio and placed in a nylon milling jar with zirconia grinding balls. Isopropanol was added as a medium in grinding, and the raw materials were wet ground for 12 h. After grinding, the slurry was poured out, dried, and calcined at 850 ℃ for 2 h. The calcined powder with isopropanol was further ground for 22 h. Afterwards, the slurry with 0.2% of binder was ground for additional 2 h. The slurry obtained after further grinding was dried, sieved, and pressed into green ceramic pellets with a diameter of 10 mm and a thickness of 1-2 mm. The green pellets were placed in a muffle furnace, heated at a rate of 2 ℃/min to 600 ℃, and held for 6 h to allow binder burnout. After debinding, the pellets were embedded in an alumina crucible with calcined powder of the same composition (without binder) and sintered at 1050-1400 ℃ (with higher sintering temperatures corresponding to higher ST content) for 2 h. The sintered ceramics were then ground and polished. Silver paste was applied on the both sides of the ceramics and heat-treated at 850 ℃ for 20 min to form silver electrodes. Alternatively, gold electrodes were deposited on the both sides by an ion sputtering coater. The phase composition of the ceramic powders was analyzed by a model Smartlab X-ray diffractometer (XRD) (Rigaku Co., Japan). The Raman spectra were determined on well-polished ceramic samples by a model Alpha 300R Raman imaging microscope (WITec Co., Germany). The microstructure of the materials was characterized by a model Regulus 8230 high-resolution cold-field emission scanning electron microscope (Hitachi Co., Japan). The temperature-dependent dielectric properties were measured by a model IM3536 LCR meter (HIOKI Co., Japan) equipped with a model HCP421V-MP heating stage (INSTEC Co., USA). The polarization-electric field (P-E) hysteresis loops of the ceramics were tested by a model Multiferroic II ferroelectric analyzer (Radiant Co., USA).

Results and discussion

The results show that the (1-x)K0.5Bi0.5TiO3-xSrTiO3(KBT-ST) lead-free dielectric ceramic system is synthesized by a conventional solid-state reaction method. The effect of SrTiO3 incorporation on the microstructure, phase evolution, and electrical properties of the materials is systematically investigated.

The XRD patterns and SEM images confirm the formation of a single perovskite phase and a dense microstructure for all the compositions. The temperature stability of the dielectric constant is significantly enhanced, accompanied by a shift of the dielectric peak towards lower temperatures, as SrTiO3 content increases. The gradual slimming of polarization-electric field hysteresis loops indicates a transformation from a typical ferroelectric to a relaxor ferroelectric state. The optimal composition (i.e., 0.6KBT-0.4ST) exhibits a high recoverable energy storage density of 3.64 J/cm3 and an energy efficiency of 70 % in an electric field of 210 kV/cm. This work demonstrates that KBT-ST ceramics constitute a highly promising lead-free dielectric system for high-performance energy storage applications.

Conclusions

In this work, KBT-ST lead-free ceramics were prepared by a solid-state sintering method. Their structural evolution, properties, and potential for dielectric energy storage applications were systematically investigated. Single-phase

perovskite-structured KBT-ST solid solutions were successfully synthesized. The lattice contraction occurred, and the incorporation of Sr2+ effectively introduced A-site compositional disorder as the ST content increased. The addition of ST effectively suppressed a long-range ferroelectric order, thus inducing a transition from a ferroelectric to a relaxor ferroelectric state. This transition was evidenced by enhanced frequency dispersion of the dielectric peak, slimmer polarization-electric field hysteresis loops, and improved temperature stability of the dielectric constant. The optimal energy storage performance was achieved in the composition with x of 0.4, which exhibited the optimal overall energy storage properties. The introduction of Sr2+ produced a synergistic effect. It enhanced a local polarization, and suppressed a long-range ferroelectric order, promoting the formation of an ergodic relaxor state. The effects both contributed to a reduction in (Pmax-Pr). The high breakdown strength of 0.6KBT-0.4ST, combined with the high polarization contributed by the hybridization between Bi 6s and O 2p orbitals, collectively yielding a high recoverable energy density of 3.64 J/cm3 and a high energy efficiency of 70 %. Furthermore, this composition demonstrated superior cycling stability and temperature stability in its energy storage performance. In summary, A-site modification of KBT ceramics through SrTiO3 solid solution was an effective strategy for optimizing their energy storage properties. This study could present a promising lead-free energy storage ceramic system and provide a valuable reference for designing high-performance relaxor ferroelectrics via tuning local structural disorder.

, authors=Xinying ZHU, Letao YANG, Houbing HUANG, authorsList=Xinying ZHU, Letao YANG, Houbing HUANG, authorCompany=null, correspAuthors=Letao YANG, Houbing HUANG, authorNote=

ZHU Xinying (2003-), male, Master candidate. E-mail:

, correspAuthorsNote=
YANG Letao (1991-), male, Ph.D., Assistant Professor. E-mail: ;
HUANG Houbing (1986-), male, Ph.D., Professor.
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为应对铅基电介质陶瓷带来的环境问题并满足高性能、高功率储能电容器的需求,开发高效无铅储能材料至关重要。本工作采用传统固相反应法成功制备了(1-x)K0.5Bi0.5TiO3-xSrTiO3(KBT-ST)无铅介电陶瓷体系。系统研究了SrTiO3引入对材料微观结构、相演变及电学性能的影响。结果表明,所有组分均形成单一钙钛矿相,且显微结构致密;随着SrTiO3含量的增加,陶瓷的介电常数温度稳定性显著提升,介电峰向低温移动;电滞回线逐渐变细证明材料从典型铁电体转变为弛豫铁电体。其中,最优组分0.6KBT-0.4ST在210 kV/cm电场下获得了高达3.64 J/cm3的可回收储能密度及70%的能量效率,表明KBT-ST陶瓷极具应用前景的高性能无铅储能电介质体系。

, authors=朱欣颖, 杨乐陶, 黄厚兵, authorsList=朱欣颖, 杨乐陶, 黄厚兵, authorCompany=null, correspAuthors=杨乐陶, 黄厚兵, authorNote=

朱欣颖(2003—),男,硕士研究生。

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杨乐陶(1991—),男,博士,助理教授;
黄厚兵(1986—),男,博士,教授。
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K0.5Bi0.5TiO3-SrTiO3陶瓷的制备及储能性能
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朱欣颖 , 杨乐陶 , 黄厚兵
硅酸盐学报 | 研究论文 2026,54(6): 1901-1909
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硅酸盐学报 |研究论文 2026 , 54 (6) : 1901 -1909
K0.5Bi0.5TiO3-SrTiO3陶瓷的制备及储能性能
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朱欣颖 , 杨乐陶 , 黄厚兵
作者信息
  • 北京理工大学材料学院,北京理工大学前沿交叉科学院,北京 100081
通讯作者:
杨乐陶(1991—),男,博士,助理教授;
黄厚兵(1986—),男,博士,教授。
作者简介:

朱欣颖(2003—),男,硕士研究生。

Energy Storage Properties of K0.5B0.5TiO3-SrTiO3 Ceramics
Xinying ZHU , Letao YANG , Houbing HUANG
Affiliations
  • Beijing Institute of Technology, School of Materials Science and Engineering, and School of Interdisciplinary Science, Beijing 100081, China
  • Corresponding Author:
    YANG Letao (1991-), male, Ph.D., Assistant Professor. E-mail: ;
    HUANG Houbing (1986-), male, Ph.D., Professor.

    ZHU Xinying (2003-), male, Master candidate. E-mail:

出版时间: 2026-05-13 doi: 10.14062/j.issn.0454-5648.20250948
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为应对铅基电介质陶瓷带来的环境问题并满足高性能、高功率储能电容器的需求,开发高效无铅储能材料至关重要。本工作采用传统固相反应法成功制备了(1-x)K0.5Bi0.5TiO3-xSrTiO3(KBT-ST)无铅介电陶瓷体系。系统研究了SrTiO3引入对材料微观结构、相演变及电学性能的影响。结果表明,所有组分均形成单一钙钛矿相,且显微结构致密;随着SrTiO3含量的增加,陶瓷的介电常数温度稳定性显著提升,介电峰向低温移动;电滞回线逐渐变细证明材料从典型铁电体转变为弛豫铁电体。其中,最优组分0.6KBT-0.4ST在210 kV/cm电场下获得了高达3.64 J/cm3的可回收储能密度及70%的能量效率,表明KBT-ST陶瓷极具应用前景的高性能无铅储能电介质体系。

无铅介电陶瓷  /  弛豫铁电体  /  储能密度  /  钛酸铋钾陶瓷
Introduction

Dielectric capacitors are widely used in pulsed power and electronic systems due to their high power density, long lifespan, and low cost. However, their energy density is considerably lower than that of batteries. Dielectric materials are the core components for enhancing capacitor performance. Although conventional lead-based ceramics (e.g., PZT) exhibit the superior properties, their toxicity drives the development of environmentally friendly lead-free alternatives as a major research focus. Bismuth-based perovskite materials, due to the similar electronic configurations of Bi3+ and Pb2+, demonstrate ferroelectric properties comparable to those of lead-based materials. Among them, bismuth potassium titanate (i.e., K0.5Bi0.5TiO3, KBT) stands out as a highly promising lead-free energy storage candidate due to its combination of high theoretical polarization and a wide bandgap. However, a pure KBT is a typical ferroelectric with a high remnant polarization, which limits its energy storage performance. In general, introducing a paraelectric material into a ferroelectric to form a relaxor ferroelectric can disrupt a long-range order and refine ferroelectric domains, thereby improving energy storage characteristics. This study selected quantum paraelectric SrTiO3 (ST) to form a solid solution with KBT. The effect of ST content on the crystal structure, microstructure, dielectric, and ferroelectric properties was investigated. The ceramics maintained a pure perovskite phase with increasing ST content, showing a shift of the dielectric peak to lower temperatures with an enhanced frequency dispersion and gradually slimmer polarization-electric field hysteresis loops. The optimal composition (i.e., 0.6KBT-0.4ST) achieved a recoverable energy storage density of 3.64 J/cm3 and an energy efficiency of 70% in an electric field of 210 kV/cm, along with good temperature and frequency stability. The results indicated that KBT-ST is a promising class of high-performance lead-free dielectric materials for energy storage applications.

Methods

In this study, (1-x)KBT-xST ceramics (where x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by a conventional solid-state sintering method. The starting raw materials were Bi2O3 (≥99%), K2CO3 (≥99%), TiO2 (≥99%), and SrCO3 (≥99%), from Aladdin Co., China. Prior to weighing, K2CO3 powder was dried in a muffle furnace at 200 ℃ for 2 h to remove absorbed moisture. The raw materials were then weighed according to the stoichiometric ratio and placed in a nylon milling jar with zirconia grinding balls. Isopropanol was added as a medium in grinding, and the raw materials were wet ground for 12 h. After grinding, the slurry was poured out, dried, and calcined at 850 ℃ for 2 h. The calcined powder with isopropanol was further ground for 22 h. Afterwards, the slurry with 0.2% of binder was ground for additional 2 h. The slurry obtained after further grinding was dried, sieved, and pressed into green ceramic pellets with a diameter of 10 mm and a thickness of 1-2 mm. The green pellets were placed in a muffle furnace, heated at a rate of 2 ℃/min to 600 ℃, and held for 6 h to allow binder burnout. After debinding, the pellets were embedded in an alumina crucible with calcined powder of the same composition (without binder) and sintered at 1050-1400 ℃ (with higher sintering temperatures corresponding to higher ST content) for 2 h. The sintered ceramics were then ground and polished. Silver paste was applied on the both sides of the ceramics and heat-treated at 850 ℃ for 20 min to form silver electrodes. Alternatively, gold electrodes were deposited on the both sides by an ion sputtering coater. The phase composition of the ceramic powders was analyzed by a model Smartlab X-ray diffractometer (XRD) (Rigaku Co., Japan). The Raman spectra were determined on well-polished ceramic samples by a model Alpha 300R Raman imaging microscope (WITec Co., Germany). The microstructure of the materials was characterized by a model Regulus 8230 high-resolution cold-field emission scanning electron microscope (Hitachi Co., Japan). The temperature-dependent dielectric properties were measured by a model IM3536 LCR meter (HIOKI Co., Japan) equipped with a model HCP421V-MP heating stage (INSTEC Co., USA). The polarization-electric field (P-E) hysteresis loops of the ceramics were tested by a model Multiferroic II ferroelectric analyzer (Radiant Co., USA).

Results and discussion

The results show that the (1-x)K0.5Bi0.5TiO3-xSrTiO3(KBT-ST) lead-free dielectric ceramic system is synthesized by a conventional solid-state reaction method. The effect of SrTiO3 incorporation on the microstructure, phase evolution, and electrical properties of the materials is systematically investigated.

The XRD patterns and SEM images confirm the formation of a single perovskite phase and a dense microstructure for all the compositions. The temperature stability of the dielectric constant is significantly enhanced, accompanied by a shift of the dielectric peak towards lower temperatures, as SrTiO3 content increases. The gradual slimming of polarization-electric field hysteresis loops indicates a transformation from a typical ferroelectric to a relaxor ferroelectric state. The optimal composition (i.e., 0.6KBT-0.4ST) exhibits a high recoverable energy storage density of 3.64 J/cm3 and an energy efficiency of 70 % in an electric field of 210 kV/cm. This work demonstrates that KBT-ST ceramics constitute a highly promising lead-free dielectric system for high-performance energy storage applications.

Conclusions

In this work, KBT-ST lead-free ceramics were prepared by a solid-state sintering method. Their structural evolution, properties, and potential for dielectric energy storage applications were systematically investigated. Single-phase

perovskite-structured KBT-ST solid solutions were successfully synthesized. The lattice contraction occurred, and the incorporation of Sr2+ effectively introduced A-site compositional disorder as the ST content increased. The addition of ST effectively suppressed a long-range ferroelectric order, thus inducing a transition from a ferroelectric to a relaxor ferroelectric state. This transition was evidenced by enhanced frequency dispersion of the dielectric peak, slimmer polarization-electric field hysteresis loops, and improved temperature stability of the dielectric constant. The optimal energy storage performance was achieved in the composition with x of 0.4, which exhibited the optimal overall energy storage properties. The introduction of Sr2+ produced a synergistic effect. It enhanced a local polarization, and suppressed a long-range ferroelectric order, promoting the formation of an ergodic relaxor state. The effects both contributed to a reduction in (Pmax-Pr). The high breakdown strength of 0.6KBT-0.4ST, combined with the high polarization contributed by the hybridization between Bi 6s and O 2p orbitals, collectively yielding a high recoverable energy density of 3.64 J/cm3 and a high energy efficiency of 70 %. Furthermore, this composition demonstrated superior cycling stability and temperature stability in its energy storage performance. In summary, A-site modification of KBT ceramics through SrTiO3 solid solution was an effective strategy for optimizing their energy storage properties. This study could present a promising lead-free energy storage ceramic system and provide a valuable reference for designing high-performance relaxor ferroelectrics via tuning local structural disorder.

lead-free dielectric ceramics  /  relaxor ferroelectrics  /  energy storage density  /  potassium bismuth titanate ceramics
朱欣颖, 杨乐陶, 黄厚兵. K0.5Bi0.5TiO3-SrTiO3陶瓷的制备及储能性能. 硅酸盐学报, 2026 , 54 (6) : 1901 -1909 . DOI: 10.14062/j.issn.0454-5648.20250948
Xinying ZHU, Letao YANG, Houbing HUANG. Energy Storage Properties of K0.5B0.5TiO3-SrTiO3 Ceramics[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (6) : 1901 -1909 . DOI: 10.14062/j.issn.0454-5648.20250948
  • 国家自然科学基金(52302277)
  • 新型陶瓷材料全国重点实验室开放课题资助(KF202401)
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2026年第54卷第6期
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doi: 10.14062/j.issn.0454-5648.20250948
  • 接收时间:2025-12-30
  • 首发时间:2026-10-22
  • 出版时间:2026-05-13
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  • 收稿日期:2025-12-30
  • 修回日期:2026-01-26
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国家自然科学基金(52302277)
新型陶瓷材料全国重点实验室开放课题资助(KF202401)
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    北京理工大学材料学院,北京理工大学前沿交叉科学院,北京 100081

通讯作者:

杨乐陶(1991—),男,博士,助理教授;
黄厚兵(1986—),男,博士,教授。
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2种不同金属材料的力学参数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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